<!DOCTYPE html>
<html>
<head>
    <title></title>
</head>
<body>
      <form action="/login">
          <input type="text" name="uname"/>
          <select name="group">
              <option value="1">群组1</option>
              <option value="2">群组2</option>
          </select>
          <input type="submit"value="登录"/>
      </form>
</body>
</html>